Total ReDoS: the dangers of regex in JavaScript - Phil Nash - CPH DevFest 2024

This talk was recorded at Copenhagen Developers Festival in Copenhagen, Denmark. #cphdevfest #ndcconferences #developer #softwaredeveloper Attend the next NDC conference near you: https://ndcconferences.com https://cphdevfest.com/ Subscribe to our YouTube channel and learn every day: / @NDC Follow our Social Media! https://www.facebook.com/ndcconferences https://twitter.com/NDC_Conferences https://www.instagram.com/ndc_conferences/ #javascript #security Regular expressions are complicated and can be hard to learn. On top of that, they can also be a security risk; writing the wrong pattern can open your application up to denial of service attacks. One token out of place and you invite in the dreaded ReDoS. In this talk we’ll track down the patterns that can cause this trouble, explain why they are an issue and propose ways to fix them now and avoid them in the future. Together we’ll demystify these powerful search patterns and keep your application safe from expressions that are anything but regular.